Romeo's time for passion (4)
I believe the answer is:
rage
'passion' is the definition.
(synonyms)
'romeo's time' is the wordplay.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'time' becomes 'age' (an age is a period of time).
'r'+'age'='RAGE'
'for' acts as a link.
(Other definitions for rage that I've seen before include "Violent anger, maybe on road" , "Uncontrollable anger" , "Mania" , "Uncontrolled anger" , "Fierce anger" .)